index contrast silicon-on-insulator material platform, it is challenging to accurately control the
grating strength and achieve narrow spectral bandwidths. Here we demonstrate a novel
Bragg grating geometry utilizing a silicon subwavelength grating (SWG) waveguide with
evanescently coupled periodic Bragg loading segments placed outside the SWG core. We
report experimental 3 dB filter bandwidths in a range from 8 nm to 150 pm by adjusting the …